The correct option is A Rauwilfia serpentina
Reserpine is an alkaloid extracted from the roots of the plant, 𝘙𝘢𝘶𝘸𝘰𝘭𝘧𝘪𝘢 𝘴𝘦𝘳𝘱𝘦𝘯𝘵𝘪𝘯𝘢 and it has been used as an antihypertensive medication i.e., to reduce high blood pressure. It produces a fall in B.P known as hypotension. Apart from being an antihypertensive drug, Reserpine is also an antipsychotic/traquilizer used in reducing anxiety and tension producng a calming/soothing effect.
So, the correct answer is ' 𝘙𝘢𝘶𝘸𝘰𝘭𝘧𝘪𝘢 𝘴𝘦𝘳𝘱𝘦𝘯𝘵𝘪𝘯𝘢'.